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1.1 root 1: x := 1 ----> 1
2: y := 2 ----> 2
3: x <-> y ----> 2
4: y <-> x ----> 2
5: (x <-> y) & &fail ----> none
6: x ----> 1
7: y ----> 2
8: Run-time error 111 at line 16 in expr56.icn
9: variable expected
10: offending value: 1
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